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3 years ago

8

Halving the distance (i.e., decreasing by a factor of two) between two charged objects will cause the electrical force between t

hem to be ___ the initial force.

1 answer:

Tcecarenko [31]3 years ago

7 0

Explanation:

Below is an attachment containing the solution.

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How does evaporation happen on a stove<br> (dont mind the subject btw)

Shtirlitz [24]

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Answer: Evaporation happens by heat being transferred to the pot, then the pot transfering the heat to the water, which caused the water to vibrate more, eventually turning it into water vapor, which is how evaporation happens on the stove.

Explanation:

I hope this helped!

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3 0

3 years ago

Read 2 more answers

A car travels 90 km/h. How long does it take for the car to travel

koban [17]

Answer:

4.44 hr

Explanation:

distance= rate*time

400km/(90 km/hr)=time

time=4.44 hr

4 0

3 years ago

a ferry which runs at 12m/s in still water travels between towns a and b on a river which flows south at 9 m/s. the ferry leavs

Reil [10]

Answer:

= 15 m/s

Explanation:

Considering right side(west) as positive x-axis and south as negative y-axis.

velocity of boat in still water $v_b=12\hat{i}$

velocity of stream $v_s=-9\hat{j}$

now relative velocity of boat w.r.t. stream $v_{b/s}=12\hat{i}+9\hat{j}$

this velocity with which ac distance will be covered.

therefore magnitude of $v_{b/s} =\sqrt{12^2+9^2}$

= 15 m/s

6 0

3 years ago

Forces start and change the motion of an object. Question 1 options: True False

Vlad1618 [11]

I think it’s true I may be wrong tho

8 0

3 years ago

A ball is tossed vertically upwards with a speed of 5.0 m s–1. After how many seconds will the ball return to its initial positi

mezya [45]

Answer:

1.02 seconds

Explanation:

Initial velocity = u = 5 m/s

t = Time taken

s = Displacement travelled = 0

a = Acceleration due to gravity = -9.81 m/s² (negative sign due to direction)

Equation of motion

$s=ut+\frac{1}{2}at^2\\\Rightarrow 0=5t+\frac{1}{2}-9.81\times t^2\\\Rightarrow 0=5t-4.905t^2\\\Rightarrow 0=t(5-4.905t)\\\Rightarro 0=5-4.905t\\\Rightarrow t=\frac{-5}{-4.905}=1.02\ seconds$

So, time taken to return to its initial position is 1.02 seconds

7 0

4 years ago